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Castell Llygoden is a prehistoric platform cairn situated in Wales on bedrock composed of Llandovery rocks, a sequence of mudstone, siltstone and sandstone formed during the Llandovery period. The monument is protected by Cadw, the heritage authority for Wales, under the reference number BR370.
Platform cairns are substantial earthen or stone mounds constructed during the Neolithic and Bronze Age periods, typically serving as funerary or ceremonial monuments. Their defining characteristic is a relatively flat upper surface bordered by a kerb of stone or earthwork, distinguishing them from round cairns. The construction of such monuments required considerable communal effort and investment of labour, indicating their importance to the societies that built them.
The underlying geology of the Castell Llygoden site—soft sedimentary rock that would have been vulnerable to erosion—shaped both the monument's construction and its survival. The local stone sources available to prehistoric builders would have influenced the materials used and the monument's structural approach. Today, Castell Llygoden remains a significant record of prehistoric ritual practice and community organisation in the Welsh landscape.
Castell Llygoden platform cairn is a scheduled monument protected by Cadw under reference BR370. View the official record →
Castell Llygoden is a prehistoric platform cairn situated in Wales on bedrock composed of Llandovery rocks, a sequence of mudstone, siltstone and sandstone formed during the Llandovery period. It is designated a Scheduled Ancient Monument by Cadw under reference BR370.
Castell Llygoden platform cairn dates from the prehistoric period, and is classified as a platform cairn. It is one of over 32,000 scheduled monuments protected across the UK.
Castell Llygoden platform cairn is a Scheduled Ancient Monument, legally protected by Cadw — the body responsible for designating and safeguarding heritage sites in Wales. The official designation reference is BR370.
Several scheduled monuments lie within 10 km, including Cairn Cemetery on Esgair Gerwyn (1.1 km), Esgair Irfon round cairn (4.1 km), Drygarn Fach round cairn (4.4 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Castell Llygoden platform cairn's history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Castell Llygoden platform cairn stands on Llandovery Rocks (Undifferentiated), bedrock that formed in the Llandovery. The rock here is mudstone, siltstone and sandstone.